Ford Motor Co.’s motions to compel arbitration of the named plaintiffs’ claims in a class action about allegedly defective transmissions in F-150 trucks presented a “logical conundrum” on an issue where federal law is “somewhat muddled.” Although the arbitration provisions in financing agreements the plaintiffs signed with Ford dealers were broad enough to delegate disputes about arbitrability to arbitrators, Ford wasn’t a party to the contracts.And the plaintiffs insisted they …